ubuntu 解决apt报错 E: Some index files failed to download. They have been ignored, or old ones used inst

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网络上的解决方案大致有两个,我都用了，最后问题解决了。不太清楚是那个方法解决问题的。

方法一：修改DNS服务器

vim /etc/resolv.conf 

然后添加：

nameserver 8.8.8.8
nameserver 8.8.4.4

阿里源的再添加：

nameserver 223.5.5.5  
nameserver 223.6.6.6

最后运行

apt-get update

可能会有一些找不到，先别管，然后接着再apt-get install下载文件实施。

如果不行，尝试方法二。

方法二：更换apt源

vim /etc/apt/sources.list

可以把之前的都注释调，然后添加：

deb http://mirrors.aliyun.com/ubuntu/ xenial main restricted universe multiverse
deb http://mirrors.aliyun.com/ubuntu/ xenial-security main restricted universe multiverse
deb http://mirrors.aliyun.com/ubuntu/ xenial-updates main restricted universe multiverse
deb http://mirrors.aliyun.com/ubuntu/ xenial-backports main restricted universe multiverse
##测试版源
deb http://mirrors.aliyun.com/ubuntu/ xenial-proposed main restricted universe multiverse
# 源码
deb-src http://mirrors.aliyun.com/ubuntu/ xenial main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ xenial-security main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ xenial-updates main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ xenial-backports main restricted universe multiverse
##测试版源
deb-src http://mirrors.aliyun.com/ubuntu/ xenial-proposed main restricted universe multiverse
# Canonical 合作伙伴和附加
deb http://archive.canonical.com/ubuntu/ xenial partner

保存关闭。

apt-get update

然后再下载试试。

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